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Two-site double-core-hole states formed when fast protons capture electrons from aligned N2
Stockholm University, Faculty of Science, Department of Physics.
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2011 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 44, no 17, 175201- p.Article in journal (Refereed) Published
Abstract [en]

We report on an experimental investigation of 1.04 MeV H++N2 electron transfer collisions. The fast protons were stored in the electron-cooler ion-storage ring, CRYRING and the molecular nitrogen target was provided with a supersonic gas jet. We report momentum distributions of atomic nitrogen dissociation products Nq+ with charge states q+ (q=1, 2, 3) which are detected in coincidence with neutralized projectiles. Further, we investigate the influence of the angle between the direction of the incoming projectile beam and the target molecular axis. The orientation of the latter is determined a posteriorly from the momentum vector of one emitted atomic nitrogen fragment ion. We find signicantly higher total yields, dominated by N+, of charged atomic dissociation products when the N2 molecular axis is perpendicular to the incoming H+-beam. The relative contributions from N2+- and N3+- fragments, however, are strongest when the N2 axis is aligned -or close to aligned- with the ion beam. This, we suggest, is due to increased probabilities for formation of two-site double-core-hole states.

Place, publisher, year, edition, pages
2011. Vol. 44, no 17, 175201- p.
National Category
Atom and Molecular Physics and Optics
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URN: urn:nbn:se:su:diva-57180DOI: 10.1088/0953-4075/44/17/175201ISI: 000294891500009OAI: diva2:414519
Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2011-12-27Bibliographically approved

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